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See detailWave-particle duality in a two atom interferometer
Schilling, U.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2008)

Detailed reference viewed: 3 (1 ULg)
Peer Reviewed
See detailEffects of fish size on agonistic sounds in the clownfish Amphiprion akallopisos : implications for the role of the swimbladder in the sound production mechanism?
Colleye, Orphal ULg; Vandewalle, Pierre ULg; Frederich, Bruno ULg et al

Conference (2008)

Clownfishes (i.e. Amphiprion akallopisos) are territorial fishes that use sound production to defend their anemone territory. They live in social groups which display a size-based dominance hierarchy. In ... [more ▼]

Clownfishes (i.e. Amphiprion akallopisos) are territorial fishes that use sound production to defend their anemone territory. They live in social groups which display a size-based dominance hierarchy. In such a system, agonistic interactions are frequent and play an important role in the social organization. In addition, these interactions are often associated with sounds. In this study, we compared the sonic features between individuals of different sizes and in different sexual status (juvenile, male and female). The existent relationship between fish size and swimbladder size also implied to seek the swimbladder role in the sound production. Sound analyses showed that juveniles, males and females had distinct sounds in the dominant frequency and pulse duration. These differences were however not in relation to the sexual state; influence of sex on sonic features being mainly the result of a size dimorphism between sexes. Differences in calls were therefore due to the respective size of the emitter. This observation highlighted the role of the swimbladder as a resonance chamber. This role was also reinforced because the experimental filling of the swimbladder with physiological liquid significantly modified the acoustic features. In A. akallopisos, frequency and pulse duration are directly related to swimbladder size, and thus to fish size. This relationship provides strong evidence that the emitter could be identified by its calls. [less ▲]

Detailed reference viewed: 24 (2 ULg)
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See detail3D Probabilistic Representations for Vision and Action
Piater, Justus ULg; Detry, Renaud ULg

Conference (2008)

Detailed reference viewed: 21 (3 ULg)
Peer Reviewed
See detailLong-term fluctuations (1979 – 2008) of the phytoplankton dynamics in the Bay of Calvi (Corsica, NW Mediterranean): relations with wind stress variability and NAO index
Goffart, Anne ULg; Hecq, Jean-Henri ULg

Conference (2008)

The development of the winter-spring phytoplankton bloom is investigated in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. Time-series results enlighten that ... [more ▼]

The development of the winter-spring phytoplankton bloom is investigated in the oligotrophic Bay of Calvi (Corsica, Ligurian Sea, Northwestern Mediterranean) since 1979. Time-series results enlighten that changes in environmental conditions in the Corsican sector have altered the coastal phytoplankton dynamics and induced a drastic reduction of the winter-spring phytoplankton biomass over the last three decades. At the local scale, variations in winter wind stress control the development of the winter-spring phytoplankton bloom and the structure of the phytoplankton assemblages. Results emphasize that the total phytoplankton biomass (chl a) is higher during high winter wind stress years. From a specific point of view, flagellates are always the dominant component of the phytoplankton bloom communities. However, diatoms tend to be more abundant during high winter wind stress years. At a wider scale, a link between the intensity of the phytoplankton bloom and the winter NAO index is established. Lastly, the decrease in phytoplankton abundance coincides with changes in zooplankton populations. As a consequence, the entire pelagic food web dynamics is affected by climate variations and the ecosystem resilience is threatened. [less ▲]

Detailed reference viewed: 29 (6 ULg)
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See detailPhotodegradation of bacteria on TiO2 thin films produced by sol-gel method
Tasseroul, Ludivine ULg; Braconnier, Benoît; Nonet, Stéphane et al

Conference (2008)

Detailed reference viewed: 12 (3 ULg)
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See detailEvolution de l’économie agricole en Province de Liège
Duquesne, Brigitte ULg

Conference (2008)

Detailed reference viewed: 18 (9 ULg)
Peer Reviewed
See detailTransfer in interlanguage phonology: the case of prosody
Rasier, Laurent ULg

Conference (2008)

Detailed reference viewed: 31 (0 ULg)
See detailJacques Derrida et l'analyse spectrale de l'oeuvre d'art
Steinmetz, Rudy ULg

Conference (2008)

Detailed reference viewed: 21 (3 ULg)
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See detailMechanical characterization of porous structures by the combined use of micro-CT and in-situ loading
Kerckhofs, Greet ULg; Schrooten, Jan; Elicegui, Laida et al

Conference (2008)

Detailed reference viewed: 9 (2 ULg)
See detailOperational monitoring of multi-qubit entanglement classes via tuning of local operations
Bastin, Thierry ULg; Thiel, C.; von Zanthier, J. et al

Conference (2008)

Detailed reference viewed: 3 (0 ULg)
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See detailVariable selection for dynamic treatment regimes: a reinforcement learning approach
Fonteneau, Raphaël ULg; Wehenkel, Louis ULg; Ernst, Damien ULg

Conference (2008)

Dynamic treatment regimes (DTRs) can be inferred from data collected through some randomized clinical trials by using reinforcement learning algorithms. During these clinical trials, a large set of ... [more ▼]

Dynamic treatment regimes (DTRs) can be inferred from data collected through some randomized clinical trials by using reinforcement learning algorithms. During these clinical trials, a large set of clinical indicators are usually monitored. However, it is often more convenient for clinicians to have DTRs which are only defined on a small set of indicators rather than on the original full set. To address this problem, we analyse the approximation architecture of the state-action value functions computed by the fitted Q iteration algorithm - a RL algorithm - using tree-based regressors in order to identify a small subset of relevant ones. The RL algorithm is then rerun by considering only as state variables these most relevant indicators to have DTRs defined on a small set of indicators. The approach is validated on benchmark problems inspired from the classical ‘car on the hill’ problem and the results obtained are positive. [less ▲]

Detailed reference viewed: 79 (7 ULg)
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See detailL’insulte « socialement correcte » ?
Meunier, Deborah ULg

Conference (2008)

Detailed reference viewed: 15 (0 ULg)
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See detailRadiative data in the Zr I spectrum obtained by Laser Induced Fluorescence
Malcheva, G.; Mayo, R.; Ortiz, M. et al

Conference (2008)

Radiative lifetimes of 17 excited states in Zr I, in the energy interval 29000 – 40974 cm-1, have been investigated using the Time-Resolved Laser-Induced Fluorescence (TR-LIF) method. The levels belong to ... [more ▼]

Radiative lifetimes of 17 excited states in Zr I, in the energy interval 29000 – 40974 cm-1, have been investigated using the Time-Resolved Laser-Induced Fluorescence (TR-LIF) method. The levels belong to the 4d25s5p, 4d35p and 4d5s25p electronic configurations were excited in a single - step process from levels belonging to the ground 4p25s2 a 3F or to low-lying 4p25s2 a 3P, a 5F terms. For 14 levels, the lifetimes have been measured for the first time. Experimental results are compared with theoretical calculations performed with a multiconfigurational relativistic Hartree–Fock method including core polarization effects. [less ▲]

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See detailImagerie fonctionnelle et coma: implications pronostiques
Vanhaudenhuyse, Audrey ULg

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailMutualisme pucerons-fourmis : étude des bénéfices retirés par les colonies d’Aphis fabae en milieu extérieur
Verheggen, François ULg; Detrain, Claire; Diez, Lise et al

Conference (2008)

Aphid-Ant relationships are common examples of mutualism. Aphids are indeed submitted to predation and therefore require protection, while ants are continuously looking for new sugar sources. The present ... [more ▼]

Aphid-Ant relationships are common examples of mutualism. Aphids are indeed submitted to predation and therefore require protection, while ants are continuously looking for new sugar sources. The present work aimed to study the benefits that a mutualistic relationship with Lasius niger (Hymenoptera : Formicidae) could bring to the black bean aphid Aphis fabae (Homoptera, Aphididae). Several parameters were observed in the field, on broad bean plants infested with an initial amount of 100 A. fabae and in presence or not of a L. niger colony. More aphids were observed on plants being visited by ants as well as a higher proportion of winged individuals. One explanation is that fewer predators were observed on plants being visited by ants, demonstrating their protective role. However, the number of parasitized aphids was not reduced in presence of L. niger. On the other hand, fewer different aphid species were present on plants foraged by ants, what suggests that they could exert a predation on unattended aphids. Our observations do not allow to conclude on any impact of L. niger on the fitness of the aphid host plant, although fewer exuvia and honeydew spots were observed when they were present. All these results confirm that L. niger increase the fitness of A. fabae colonies mainly by decreasing the number of predators and by reducing competition from aphid species unattended by ants. [less ▲]

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See detailThe Effects of Early Retirement on Youth Unemployment: The Case of Belgium
Jousten, Alain ULg

Conference (2008)

The paper studies the effect of the pension system on the unemployment of the young

Detailed reference viewed: 63 (29 ULg)
See detailThermocline characterization on modeled and observed temperature profiles: a technique for model error evaluation
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg

Conference (2008)

The thermocline position in the water column is an important variable in hydrodynamic modeling. Its characterization allows to verify the model accuracy, and analyze the parameter choice made by the ... [more ▼]

The thermocline position in the water column is an important variable in hydrodynamic modeling. Its characterization allows to verify the model accuracy, and analyze the parameter choice made by the modeler, such as the choice of the turbulence closure. A correct representation of the surface ocean boundary layer is also very important in order to correctly represent the air-sea exchanges. Moreover, coupled physicalbiological models require a good representation of the thermocline position, in order to correctly represent the population dynamics at the surface layers. We present a technique to calculate the parameters of the thermocline: depth, width and temperature. These are calculated by a least-squares fitting of individual temperature profiles (from model and observations) to a sigmoid function. The residual is also obtained, giving an estimate of the goodness of the fit. The parameters calculated allow for a comparison of the model thermocline to observations. Our approach consists in comparing the model thermocline depth, width and temperature to observations. By examining separately the accuracy of the model thermocline depth and temperature, we gain insight in the processes that need correction in the model. For example, if the model thermocline is too deep compared to observations, or the width of the thermocline is incorrect, mixing parameters and surface momentum fluxes should be revised. However, if the depth is well represented but the temperature is incorrect, the surface heat fluxes may be the source of the error. By simply comparing model and observed temperature profiles we are not able to differentiate between error sources. The technique presented here stands therefore as a useful method for model evaluation. [less ▲]

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See detailMultidisciplinary approach to study of design cognitive process: the case of human errors in architectural preliminary design
Safin, Stéphane ULg; Leclercq, Pierre ULg; Blavier, Adelaïde ULg

Conference (2008)

This contribution aims to show a multidisciplinary method to understand and formalize design process, from a cognitive point of view, in the particular case of human errors in architectural preliminary ... [more ▼]

This contribution aims to show a multidisciplinary method to understand and formalize design process, from a cognitive point of view, in the particular case of human errors in architectural preliminary design process. We first emphasize the importance of error detection and recovery in the sketching phase in architecture. After the description of our methodology, we explain the general theory and model on human error, the short study we made and our proposition of a model on hu- man error in architectural design. We finally conclude by giving some first re- quirements from this model in order to improve to the development of sketch- based CAD tools. [less ▲]

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See detailIntegrating soil and plant knowledge at different scales to better understand the dynamics of water in SPAC.
Lobet, Guillaume ULg; Chaumont, F.; Javaux, M. et al

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
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See detailLe champ d'application de la loi Breyne
Kohl, Benoît ULg

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
See detailLa nostalgie du passé colonial belge. Approche comparative
Rubbers, Benjamin ULg

Conference (2008)

Detailed reference viewed: 42 (4 ULg)
Peer Reviewed
See detail3-D gas exchange pathways in pome fruit characterised by synchrotron X-ray computed tomography
Verboven, Pieter; Kerckhofs, Greet ULg; Mebatsion, Hibru K. et al

Conference (2008)

Detailed reference viewed: 6 (1 ULg)
See detailLe service public et le droit communautaire
Durviaux, Ann-Lawrence ULg

Conference (2008)

Detailed reference viewed: 18 (0 ULg)
See detailProduire une exposition sous forte contrainte
Jaminon, Martine ULg

Conference (2008)

Detailed reference viewed: 6 (0 ULg)
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See detailDe l'esquisse à la maquette digitale : transformation des représentations graphiques en modèles numériques pour l'ingénierie de conception.
Elsen, Catherine ULg; Leclercq, Pierre ULg

Conference (2008)

Ce projet s’intéresse à la place que tient aujourd’hui l’esquisse et les représentations 3D au sein du processus de conception, et plus particulièrement au sein des phases amont de la création chez les ... [more ▼]

Ce projet s’intéresse à la place que tient aujourd’hui l’esquisse et les représentations 3D au sein du processus de conception, et plus particulièrement au sein des phases amont de la création chez les designers de produit. La question posée est la pertinence de l’esquisse au sein du système global des représentations externes et sa place actuelle dans le monde des possibles offerts par la CAO. La finalité de la recherche est l’objectivation d’un concept IHM pouvant effectivement et efficacement supporter les designers en phase créative. [less ▲]

Detailed reference viewed: 110 (29 ULg)
See detailAperture imaging beyond the classical resolution limit by using incoherent photons
Thiel, C.; Bastin, Thierry ULg; von Zanthier et al

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
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See detailConformal doping of FINFET's : a fabrication and metrology challenge
Vandervorst, Wilfried; Eyben, Pierre; Mody, Jay et al

Conference (2008)

Detailed reference viewed: 43 (0 ULg)
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See detailAphid-ant mutualism: How do aphids focus ant foraging?
Verheggen, François ULg; Detrain, Claire; Diez, Lise et al

Conference (2008)

Detailed reference viewed: 10 (5 ULg)
See detailL'économie céréalière : aspects prospectifs
Burny, Philippe ULg

Conference (2008)

Detailed reference viewed: 3 (0 ULg)
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See detailLe commerce équitable : leçons d’expériences
Duquesne, Brigitte ULg; Lebailly, Philippe ULg

Conference (2008)

Detailed reference viewed: 65 (24 ULg)
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See detailConstruction et droit de la consommation: propos introdutifs
Kohl, Benoît ULg

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailOn the complementarity of contrastive linguistics and interlanguage studies
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2008)

Detailed reference viewed: 16 (1 ULg)
Peer Reviewed
See detailHealthy and safe food for everybody
Jijakli, Haissam ULg

Conference (2008)

Detailed reference viewed: 3 (1 ULg)
See detailCoupling of N Qubits to Any Dicke State via Projective Measurements
Thiel, C.; Maser, A.; Bastin, Thierry ULg et al

Conference (2008)

Detailed reference viewed: 7 (0 ULg)
Peer Reviewed
See detailAphid-ant mutualism: an outdoor study of the benefits for Aphis fabae
Verheggen, François ULg; Detrain, Claire; Diez, Lise et al

Conference (2008)

Detailed reference viewed: 17 (6 ULg)
See detailVanadium oxide-based mesoporous films as positive electrode material in Li-ion batteries
Krins, Natacha ULg; Caes, Sébastien ULg; Arrebola, José-Carlos et al

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
See detailTowards a new definition of Cooksonia Lang, 1937
Gonez, Paul ULg; Gerrienne, Philippe ULg

Conference (2008)

Detailed reference viewed: 6 (0 ULg)
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See detailEvolution of the clinical expression of Bluetongue in Belgian cattle during year 2006 vs 2007
Guyot, Hugues ULg; Mauroy, Axel ULg; Rollin, Frédéric ULg et al

Conference (2008)

In August 2006, Belgium notified its first cases of Bluetongue (BT), serotype 8, in cattle and sheep. The disease was also observed at this time in the neighboring countries. The resurgence of BT was ... [more ▼]

In August 2006, Belgium notified its first cases of Bluetongue (BT), serotype 8, in cattle and sheep. The disease was also observed at this time in the neighboring countries. The resurgence of BT was observed in Northern Europe in 2007. The aim of the study was to compare clinical signs of BT observed in 2006 vs 2007 in Belgian cattle. The description of clinical signs was based on the observation of 38 and 39 cows in 2006 and 2007, respectively. BT cases were only included if they were confirmed by one or both laboratory diagnostic tests (competitive ELISA test and/or RT-qPCR). The inventory of clinical signs was made with a standardised clinical form for BT. This form is divided into general, cutaneous, locomotor, digestive, respiratory, neurological and reproductive clinical signs. Case data were summarised to determine changes in clinical presentation of BT between 2006 and 2007. A Fischer’s exact probability test was performed to compare (P<0.05) the frequency of clinical signs between the two years. Regarding general clinical signs, hyperthermia and tiredness were more often observed in 2007, compared to 2006. All clinical signs about skin and annexes were not significantly different between the two years. Locomotor signs such as prostration, incapacity to get up, reluctance to move, lameness and amyotrophy were more frequent in 2007. Loss of appetite, difficulties in grasping feed, salivation and drooling were the digestive signs more often observed in 2007. A purulent nasal discharge was the only respiratory sign more commonly observed in 2007. Apathy, generalised weakness and paresis or paralysis were more often encountered in 2007. The most important changes between the two years concerned reproduction. A higher incidence of abortion, premature calving and stillbirth was observed during 2007 outbreak. The frequency of most of the clinical signs of BT was higher in 2007 in Belgian cattle. Confirmed cases of BT in Belgian cattle were only 296 in 2006 compared to 4187 in 2007. These data do not represent the real situation of BT infection because the farmers do not notify all cases. Nevertheless, it seems that the 2007 outbreak was more severe regarding the number of cases and the frequency of clinical signs. The mild winter and wet 2007 summer might have favored the persistence of the vectors. [less ▲]

Detailed reference viewed: 17 (2 ULg)
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See detailNon-native prosody: production and perception of accent
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
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See detailThe Hybrid Finite-Element Mixing-Cell method: a new flexible method for large scale groundwater modelling
Orban, Philippe ULg; Brouyère, Serge ULg; Wildemeersch, Samuel ULg et al

Conference (2008)

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from ... [more ▼]

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from black-box models to physically based distributed models have been used in various hydrogeological conditions. Black-box models, such as transfer functions, have been applied for example to model groundwater in large scale hydrological models, to model karstic systems, in particular for the interpretation of isotopic data. Their concepts are simple and attractive because they require relatively few data. The main drawbacks are however that modelling results are not spatially distributed and their predictive capability is questionable due to the semi-empirical nature of process descriptions. On the contrary, due to a more advanced description of ongoing processes, physically-based distributed models are expected to have better predictive capabilities than black-box models. However, because such models require more data, they are generally applied for case studies that are better characterized from a hydrogeological point of view, for which the distribution of water levels or solute concentrations in the groundwater systems are needed. For large-scale modelling purposes, black-box models and physically-based distributed models have both proved their utilities and have their own justifications, advantages and disadvantages. However, few attempts have been made to combine the advantages of these two categories of approaches in a unified modelling application. A new flexible modelling approach, the Hybrid Finite-Element Mixing-Cell method (HFEMC), has been developed that allows combining in a single model, and in a fully integrated way, different mathematical approaches of various complexities for groundwater modelling in complex and large scale environments. This method has been implemented in the groundwater flow and solute transport numerical code SUFT3D. The approach has been first tested and illustrated using basic and advanced “synthetic” examples that allow validating and discussing its advantages over existing modelling concepts. The HFEMC approach is now applied for the development of a large scale groundwater flow and solute transport model in different groundwater basins in Belgium. [less ▲]

Detailed reference viewed: 126 (45 ULg)
See detailPrise de décision et gestion des risques
Nyssen, Anne-Sophie ULg

Conference (2008)

Detailed reference viewed: 20 (3 ULg)
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See detailImpact of Prosthesis-Patient Mismatch on Short-term Mortality Following Mitral Valve Replacement.
Magne, Julien ULg; Mathieu, P; Dumesnil, JG et al

Conference (2008)

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See detailDistributed Collaborative Design Studio : a sketch-based environment to support rich distant collaboration. Workshop.
Safin, Stéphane ULg; Delfosse, Vincent ULg; Elsen, Catherine ULg et al

Conference (2008)

An increasing number of large scale projects requires that distant teams collaborate together remotely. At the same time, the current CAD tools only offer minimal support for partial and asynchronous ... [more ▼]

An increasing number of large scale projects requires that distant teams collaborate together remotely. At the same time, the current CAD tools only offer minimal support for partial and asynchronous interactions. The application we propose enables full synchronous and remote sketch-based collaborative design. This setup is a combination of a virtual desktop (a remote meeting table), a standard videoconference system, a gesture recognition module and a networked, real-time, collaborative drawing software (SketSha). The solution as a whole is multimodal in essence (gestures, speech, drawing…) supporting immersive remote collaborative design. [less ▲]

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See detailRisk-aware decision making and dynamic programming
Defourny, Boris ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

Conference (2008)

This paper considers sequential decision making problems under uncertainty, the tradeoff between the expected return and the risk of high loss, and methods that use dynamic programming to find optimal ... [more ▼]

This paper considers sequential decision making problems under uncertainty, the tradeoff between the expected return and the risk of high loss, and methods that use dynamic programming to find optimal policies. It is argued that using Bellman's Principle determines how risk considerations on the return can be incorporated. The discussion centers around returns generated by Markov Decision Processes and conclusions concern a large class of methods in Reinforcement Learning. [less ▲]

Detailed reference viewed: 108 (14 ULg)
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See detailHigh-resolution clutter-power estimation for range-dependence compensation in conformal-array STAP
Ries, Philippe; Lapierre, Fabian D.; Lesturgie, Marc et al

Conference (2008)

Detailed reference viewed: 12 (0 ULg)
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See detailScaffolds for bone tissue engineering: design, production and evaluation
Schrooten, Jan; Impens, Saartje; Chen, Y. et al

Conference (2008)

Detailed reference viewed: 8 (0 ULg)
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See detailProbable microfossils in 3.2 Ga-old shallow-water siliciclastic deposits
Javaux, Emmanuelle ULg; Marshall, Craig; Bekker, Andrey

Conference (2008)

Detailed reference viewed: 4 (0 ULg)
See detailVolatile blends and oxylipins profiles in potato leaves (Solanum tuberosum L.) exposed to insects infestations and mechanical wounding.
Gosset, V.; Göbel, Cornelia; Harmel, N. et al

Conference (2008)

Detailed reference viewed: 16 (4 ULg)
See detailRestoration assessment of calcareous grasslands in Belgium : soil conditions and floristic diversity
Piqueray, Julien ULg; Bottin, Gaëtan; Bisteau, Emmanuelle et al

Conference (2008)

Detailed reference viewed: 23 (4 ULg)
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See detailEnglish and Spanish Size Noun-constructions, a locus of ongoing grammaticalization
Brems, Lieselotte ULg; Verveckken, Katrien

Conference (2008)

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See detailATOMIC STRUCTURES OF HEAVY ELEMENTS : RECENT PROGRESS AND PERSPECTIVES
Biémont, Emile ULg; Fivet, V.; Palmeri, P. et al

Conference (2008)

In the present paper, we discuss some recent advances concerning the determination of new radiative parameters (transition probabilities, oscillator strengths, radiative lifetimes, branching fractions ... [more ▼]

In the present paper, we discuss some recent advances concerning the determination of new radiative parameters (transition probabilities, oscillator strengths, radiative lifetimes, branching fractions, Landé factors) in heavy ions. We also emphasize the difficulties that are frequently met in the field and that sometimes prevent obtaining accurate atomic data for the transitions of astrophysical interest. We concentrate particularly on the determination of radiative parameters for selected rare-earth (RE) ions (lanthanides and actinides) and for some atoms and ions of the sixth row of the periodic table. [less ▲]

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See detailDownscaling of the global HYCOM to the Cariaco basin (Venezuela) using ROMS
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Weisberg, R. H.

Conference (2008)

A high-resolution (1/60 degree), three-dimensional numerical circulation model of the Cariaco basin (Venezuela) is constructed by nesting the Regional Ocean Modeling System (ROMS) in the 1/12 degree ... [more ▼]

A high-resolution (1/60 degree), three-dimensional numerical circulation model of the Cariaco basin (Venezuela) is constructed by nesting the Regional Ocean Modeling System (ROMS) in the 1/12 degree global Hybrid Coordinate Ocean Model (HYCOM). The Cariaco basin is a semi-enclosed trench located along the coast of Venezuela. Its maximum depth is about 1400 m, and it is connected to the open ocean by two shallow passages: the Centinela channel in the northwest (146 m depth) and the Tortuga channel in the northeast (135 m depth). The main objective of this work is to improve our knowledge of the Cariaco basin dynamics, and to understand how the basin is influenced by the Caribbean Sea. The nesting of the Cariaco model in HYCOM is therefore crucial for these analyses. First, the annual cycle of the basin is described, using the results from a 2004 hindcast. Then, two modes of interaction between the basin and the open ocean are studied: (i) the meanders and eddies that travel westward with the Caribbean Current, and (ii) a subsurface eastward current that flows along the South America north coast. The ventilation of the basin through its channels is analyzed by studying the annual variations of the thermocline depth in the basin channels. In addition to the improved knowledge of the Cariaco basin circulation, which can help to better understand the climate of the past through paleoceanographic studies, this work is also an example of the feasibility of one of the objectives of GODAE: downscaling from a large-scale model to a regional model. In particular, the nesting ratio of 5 used in this work (from 9 km down to 1.82 km) demonstrates that a high-resolution model can be successfully nested in HYCOM. [less ▲]

Detailed reference viewed: 47 (3 ULg)
See detailAnalyse quantitative par spectroscopie proche infrarouge: Application au test d'unifomité de teneur des comprimés
Ginot, Y. M.; Bernard-Moulin, P.; Cinier, R. et al

Conference (2008)

La spectroscopie Proche infrarouge présente un large potentiel d'applications dans l'industrie pharmaceutique par sa capacité à transmettre des informations reliées à la fois à la structure chimique des ... [more ▼]

La spectroscopie Proche infrarouge présente un large potentiel d'applications dans l'industrie pharmaceutique par sa capacité à transmettre des informations reliées à la fois à la structure chimique des échantillons et à leur état physique. Elle peut être mise à profit pour des analyses qualitatives, telles l'identification des matières premières, et également pour des analyses quantitatives telles le dosage d'un principe actif dans un comprimé. Avec pour avantage une rapidité inégalée pour délivrer un résultat comparée aux techniques classiques en vigueur. Attrayante par ses performances, cette spectroscopie nécessite cependant une prise en main qui doit respecter une démarche minutieuse et souvent déroutante par son aspect heuristique (allers-retours) et à la mise en oeuvre d'outils d'analyse statistique multivariée. Si de nombreuses publications témoignent de la puissance de cet outil, il est apparu opportun de rassembler en un même texte la démarche de développement à suivre et les repères à connaître pour permettre son utilisation en analyse quantitative dans un contexte de libération pharmaceutique. Le travail de cette commission a été de rassembler les éléments issus de la pratique industrielle en se concentrant sur l'un des essais les plus intéressants: celui de l'uniformité de teneur des comprimés. Ce test est en effet l'une des applications où la rapidité de mise en oeuvre est le plus appréciable, tout en étant celui qui peut poser le plus de questions quant à la validité des résultats et la prise de décision pharmaceutique. [less ▲]

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See detailBetter use a mirror when assessing visual pursuit
Vanhaudenhuyse, Audrey ULg

Conference (2008)

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